Adjustable tie for concrete forms



Jan. 20, 1942. r A, JUHL 2,270,448

ADJUSTABLE T IE FOR CONCRETE FORMS I Filed May 51, 1939 3 Sheets-Sheetlg,

Jan. 20, 1942. j HL 2,270,448

ADJUSTABLE TIE FOR CONCRETE FORMS INVENTOR ATTORNEY Jan. 20, 1942. I A, c. JUHLU 2,270,448

ADJUSTABLE TIE FOR CONCRETE FORMS Filed May 31, 1939 3 Sheets-Sheet :5

=2 L I I0. I" II- II I" U IIII;

INVENTOR ATTORNEY Patented Jan. 20, 1942 UNITED, STATES PATENT OFFICE ADJUSTABLE TIE Fort CONCRETE FORMS Aage C. Juhl, Los Angeles, Calif. Application May 31, 1939, Serial No. 276,590

9 Claims. (c1. 25-191 different thickness and also means for aiding in its removal from the wall after the concrete has set.

It is a characteristic of my invention that, in addition to providing a tie for holding the form walls against outward lateral displacement, I

provide means for holding the form walls against inward lateral displacement, before the cement is poured, thus eliminating necessity for use of internal spacer blocks or spreaders, as required with other forms of ties.

Various means and devices have heretofore been devised for securing, the side walls of concrete forms in properly spaced relation, ranging all the way from plain galvanized, wire and strips of flat metal-commonly known as band metalto various types of bolts and more complicated devices.

When wire or strip metal is used it is intended that it remain in, and cannot be removed from, the concrete after it has set sumciently to permit the forms to be removed, and for this reason is merely passed through the sheathing forming the sides of the form and the ends tied at the outer faces by any suitable means. As such ties merely hold the sheathing against outward displacement, temporary spacer blocks or spreaders must be placed at intervals between the sheathing walls to hold them against inward displacement. In such instances the spacer blocks serve as gauges to properly space the walls, as this cannot be accurately or conveniently done in the placement of the ties. While these are inexpensive types of ties, as far as cost of material is concerned, the method of their placement and the time and labor required adds greatly to their initial cost. Also, the spacer blocks must be removed as the pouring of theconcrete progresses. One of the principal objections to the use of ties which are intended to be left in the concrete, suchas those just described, where the ends are sheared off at the face of the wall, is that the exposed endseven though covered with a plaster coating, which, at best, is porousare subject to oxidization, the result of which may be conveyance of rust and moisture to the in-* eight to sixteen inches in thickness.

color it andits finish, as well as to disfigure the outside of the wall with rust stains.

The more expensive types of ties, such as elongated bolts and the like, due to their cost, are not intended to be left in the concrete but are removed as soon as the cement has set sufficiently to warrant removal of the forms. The usual spacer blocks or braces are also generally used with such ties.

The principal objection to the use of the more expensive ties now on the market is, that rods of different lengths must be provided for the construction of walls of different thicknesses. In the case of a contractor, forinstance, who is engaged in the business of constructing walls of difierent thicknesses, he must provide ties for each different thickness of wall he constructs, the most commonly constructed walls being from This means that he must have considerable capital invested in ties that he may only use occasionally,

A further objection to the use of the last mentioned ties, is the difficulty of removing them from the concrete after ithas set. In most instances, after the end nuts, or other securing means, have been removed and the form boards taken away, they are hammered out. This not only results in damage to the rods but also to the wall. In some cases wrenches and jacks are vide a tie equippedwith means whereby it may be easily withdrawn fromthe concrete after it has set.

' It is a further object of my invention to provide a 'tie which not only embodies adjusting means whereby it may be used in connection with forms for walls of difierent thicknesses, but which adjusting means also serves as a gauge to laterally space the sides of the form with relation to each other;

And it is also an object to provide a tie which not only holds the sides of the form against lateral outward displacement, but which also holds terior of the wall, sufiicient to damage and dis- 65 them against lateral inward displacement, thus eliminating necessity for use of spacer blocks or Spreaders.

The details of my invention will be more fully set forth in the following specification, reference being made therein to the accompanying drawings, in which:

Fig. l is a fragmentary transverse sectional view of a concrete wall, with forms in place, showing the manner in which my tie is applied.

Fig. 2 is a side face view taken as indicated by the line'22 of Fig. 1;

Fig. 3 is an enlarged view of the tie shown in Fig. 1, details of which are shown partly in section;

Fig. 4 is a sectional View. taken as indicated,

by the line 44 of Fig. 3;

Fig. 5 is a fragmentary view taken as indicated by the line 55 of Fig. 3;

Fig. 6 is a prospective View of the adjusting or gauge end of the tie, showing one means of latching the adjusting nut;

Fig. 7 is a front face view or elevation of the clamping block shown in Fig. 6, showing a modified form of means for latching the adjusting nut;

Fig. 8 is a vertical sectional view taken as indicated by the line 88 in Fig. 7';

Fig. 9 is a view similar to Fig. 1,. showing another modified form of my tie;

Fig. 10 is an enlarged, longitudinal sectional view of the tie shown in Fig. 9, the rod being shown in side elevation.

Fig. 11 is a further enlarged vertical sectional view of the clamping block shown, at the right hand end of Fig. 10, showing another form of means for latching the adjusting nut.

Fig. 12 is a fragmentary face view taken as indicated by the line l2-l2 of Fig. 11.

Fig. 13 is a view taken as indicated by the line l3-l3 of Fig. 9; and

Fig. 14 is a View similar to Fig. 1, showing another way in which my adjustable blocks may be used when the tie rod is to be left in the set concrete.

Referring now to the drawings and. particularly to Figs. 1 to 5, the numeral designates the parallel, vertical side walls or sheathing of a concrete wall form, 2| the vertical braces or studding and 22 the horizontal bracing or wales. W represents the concrete wall.

In its most simplified fornfmy tie consists of a rod 23, which may be either cylindrical or polygonal, a clamping and adjustingblock, generally designated by the numeral 24, and a removable clamping block generally designated. by the numeral 25. For convenience of description I will refer to the block 24 as the adjusting block and the block 25 as the securing block, as. the latter is intended to be applied after the proper adjustment has been made and the rod 23 is in.

place, as shown in Fig. 1.

The rod 23 is provided at one. end with screw threads 25preferably of the Acme typeextending for a portion of its length, and is reduced at its opposite end to form an annular shoulder 21. The reduced portion 28 is further reduced and externally screw-threaded as at 29. Beyond the screw-threaded portion the end is further reduced as at 29a. That portion of the rod 23 intermediate the screw-threaded portion 25 and the annular shoulder 2.1, being the portion which is to be surrounded with the concrete. is preferably slightly tapered to facilitate its withdrawal from the concrete after itv has set.

The adjusting block 24' may be formed in any suitable manner, my preferred, simplified form being that shown in Figs. 1 to 5. This consists of a channel portion 30, having side flanges 3!, to which is secured a cover or face plate, generally designated by the numeral 32. The face plate 32 is made in two halves; the upper half 33 being bent over to form a flange 34 and having a central, semi-circular cut-out 35 and the lower half 35 being bent over to form a flange 31 and likewise having a central, semi-circular cut-out 38. When the two halves 33 and 36 are brought together in proper relation, the two semi-circular cut-outs form a circular aperture in the center of the composite plate 32, for a purpose to be hereinafter explained.

An adjusting nut 39 adapted to receive a wrench is mounted on the screw-threaded portion 26 of rod 23 and is provided with an annular channel 40. having sides 4| and 42, adapted to bear against the inside and outside faces, respectively, of the composite plate 32 when the two halves are brought together in proper relation. The cut-outs 35 and 38 of plates 33' and 36, are of such a size that when the two halves are brought together, they will extend into the annular channel 40' of nut 39, as shown in Figs. 3 and 4. In this manner the block 24' is carried along the screw-threaded portion 26 of rod 23 byadjusting nut 39 to ride free and clear of the screw-threads. The plates 33' and 35 may be secured together and to the channel portion 30 in any suitable manner, such as by welding. As shown in Figs. 1 and 3, flange 37 extends beyond the outer face 43 of the portion 30, to engage the bottom surface of the lower wale 22, to hold block 24 and rod 23 against rotation when the tie is in place.

As shown in Figs. 3 and 5 the sides of the screw-threaded end 26 of rod 23 are flattened, as at 44, and the block 24 is held against relative rotation thereon by means of an aperture 45, in the web of the channel portion 39, of the same shape, but slightly larger than the cross-sectional configuration of the rod; that is, the aperture has. straight sides 45 and arcuate top and bottom sides 41, as shown in Fig. 5.

The securing block 25 is rotatably mounted on a. rod 48. Rod 48'has a reduced end 49, forming an annular shoulder 50, the reduced portion extending through a circular aperture in the block and having a hand grip member 5|, non-rotatably fixed thereon by means of a pin 52. Block 25 is thus rotatably secured between shoulder 58 and the inner face of the hub of the hand grip member 5|, so the block 25 may rest against the outer faces of the wales during either the attaching or detaching operation. The opposite end of rod 48 is bored to receive the reduced portion 28 of rod 23, counter bored and internally screw-threaded to receive the screw-threaded end 29 and further counter bored to receive the further reduced end 29a. By this means the rod 48 may be properly centered on the screwthreaded end of rod 23-, so that binding and stripping of the threads will be avoided. Preferably rod 48 will be of a diameter to provide an annular shoulder 53 when it is on rod. 23.

While I have shown the hand grip member 5| non-rotatably secured to the rod 48 by pin 52, it will be readily understood that, should the type of construction require it, a more substantial. or greater force resisting connection may be used, such as screw threads supplementing the pin or welding. Also, instead of the hand grip a nut for receiving a wrench may be utilized or a construction as shown in later described. I

In ordinary practice. concrete walls range from eight to sixteen inches in thickness, although thicker walls are often constructed. The sheathing is usually made of 1 inch boards; the vertical bracing or studs 2| are 2" x 4" timbers placed edgewise to the sheathing and the wales are likewise 2" x 4" timbers placed edgewise transversely of the studs 2|. For an eight inch wall the total thickness between the outer faces of the wales is approximately 24%; inchesand for a sixteen inch wall, 32% inches. Consequently, the length of the tapered portion of the rod 23 between the shoulder 21 and the threaded portion 26 would be approximately 16 inches and the length of the threaded portion 26 would be at least 8 inches, plus the thickness of block 24 and adjusting nut 39. The length of the tapered portion 23 is such that for any given wall thickness no part of the threaded portion 26 will extend beyond the inner face of the adjacent sheathing. The length of the rod 48, or the distance between theinner face of block and shoulder 53, would remain the same for all thicknesses of walls, as it is intended that shoulders 21 and 53 abut at the outer face of the sheathing 20, as shown in Fig. 1.

The sides of flat surfaces 44 on the screwthreaded end 26 may be provided with numbered gauge marks as shown in Fig. 3, whereby the block 24 may be set for a wall of any desired thickness within the range of its use, say from eight to sixteen inches. The gauge marks 54 are so placed that when the outer face 55 of adjusting nut 39 coincides with any one of them, the adjacent numeral indicates the thickness of the wall for which it is set.

After the studs 2!, sheathing 20 and .wales 22 Fig. 10, which willbe are erected, the ties are placed. Holes 56 are bored in the sheathing, centralized with respect to the spaces between the parallel wales, the latter being spaced apart a distance sufiicient only to accommodate the rods and receive the blocks 24 and 25. By rotating the adjusting nut 39 on the screw-threaded end 26, guided by the markings on the flat surfaces 44, block 24 is set at the point desired for the thickness of the wall being constructed. This may be done either in the shop or on the job. Rod 23 is then extended through the bores 56 and the block 24 placed against the outer faces of theadjacent wales 22 with flange 31 engaging the bottom face of the lower Wale.

When the block 24 is properly set, shoulder 21 on rod 23 will be flush with the outer face of the adjacent sheathing 20 as shown in Fig. 1, with the threaded end 29 extending outwardly therefrom. Rod 48 is then screwed into the threaded end 29 and tightened up until its shoulder 53 abuts against shoulder 21, at which time plate 25 will abut against the adjacent wales 22, with the stud 54 engaging the bottom face of the lower wale 22 to hold the plate against rotation. Block 24 being non-rotatably mounted on the threaded end 26 and flange 31 engaging the bottom face of the adjacent lower Wale 22, the rod 23 is held against rotation while rod 48 is being applied. The same is true when rod 48 is being removed.

After the concrete has been poured and allowed to set for a sufficient length of time to permit removal of the forms, the rod 48 is first removed. Inasmuch as the concrete has set around the tapered portion 23, some considerable force is required to remove it. This is supplied .loose and cause a loosening up of the tie.

, screws 69.

merely by applying a wrench to the adjusting nut 39 and turning it in the direction necessary to withdraw the tapered portion 23 only a short distance through the block 24, after which it can be easily removed 'by hand.

With the above described construction and the great force which may be applied, my tie may be easily and quickly removed from the concrete without damage to either the wall or the tie.

While in the structure just described, the frictional resistance between the composite plate 32 and adjusting nut 39, when the tie is tightened, will ordinarily be sufiicient to hold the nut 32 against free rotation on the screw-threaded pore tion 26, there may be instances where the vibrations caused by construction operations and pouring the concrete, may jar the adjusting nut To offset this I have devised several forms of means for latching the adjusting nut against jarring. loose, one of which is illustrated in Fig. 6.. This consists of a wire loop, having inturned ends 51 extending into apertures 58 in thesides of block 24, whereby it can be swung from the position shown in full lines to that shown in dotted lines and. vice versa. It has a flattened portion 59 arranged to engage one of the fiat faces of the nut 39 after the tie has been adjusted for a wall of the desired thickness. l

Another type of means for latching the adjusting nut against free rotations is shown in Figs. 7 and 8. In this instance I have shown the block 24a to be a casting of suitable metal. This consists of a face or clamping surface 60 provided with side flanges 6| and a central boss 62. Boss 62 is centrally bored to form a circular seat 63 for the reception of the cylindrical end 64 of the adjusting nut 39a. Nut 39a has an annular shoulder 49a formed on its periphery, and a retaining plate, 32a, similar to composite plate 32, is provided to retain the nut 39a in its seat, the plate being provided with a circular aperture 35a to receive the nut, as in the case of composite plate 32, as shown in Fig. 8. The periphery of the cylindrical portion 64 of nut 39a is tween the ball 66 and a cap screw 68. Any num-" ber of the indents may be provided depending upon the fineness of adjustment desired. Plates 33a and 36a may be secured in place by cap In Figs. 9 to 13, inclusive, I have illustrated another form of block and latching means. The forms of block and nut are similar to those just described, except that I retain the adjusting nut in its seat by an expansilesplit ring 10.

The adjusting nut 39b is provided with an annular channel 40b and an opposite channel H is cut in the boss 620. into which the split ring 10 may expand. Channel 4% is of sufficient depth to receive the split ring 10 when it is contracted, but channel II is only of a depth to receive half the thickness of the ring, as shown in Fig. 11, so as to retain the nut 3901. against removal. v

Instead of the spring pressed detent as shown in Fig. 8 I have provided a manually operable screw 12, adapted to cooperate with a plurality of peripheral indents, 65a. Screw I2 has an intermediate screw-threaded portion 13 by which it is mounted in an internally screw-threaded boss 14. An extended end "IS-extends through a smooth bore 16 in the boss 62a and is rounded to engage in indents 65a. It is not, however, essential, that indents 65a be provided, as the end 15 engaging the periphery of the portion 62a will be sufficient to normally retain it against rotation. The lower end 11 is bent to form a handle portion by which the screw is rotated. As in the case of the detent shown in Fig. 8, any number of the indents 65a may be provided togive the desired fineness of adjustment. The screw threads 13 are such that a one quarter turn of the handle portion 11 will move the end 15 into and out of engagement with the indents 6511. Thus after the block has been placed at the desired point on the rod, and the rod inserted in the form, the handle '11 is turned to the position shown in Fig. 11, looking the nut in placeand providing a means for engaging the lower Wale, to hold the rod against turning, as shown in Fig. 9.

The adjusting block shown in Figs. 9 to 13, inclusive, may be provided on its inner face with outwardly extending flanges 18, arranged to engage the adjacent faces of the wales 22, to also hold? the rod against rotation when the tie-is in place.

While I have shown the screw 12 tobe a desirable feature in my combination, this element may be eliminated, if desired, as under all ordinary working conditions the frictional resistance between nut 39b, ring and the block will be sufiicient to hold nut 39b against free rotation. after the tie is in place in the form.

A convenient means for holding the sides of the form against inward displacement may be provided as shown in Fig. 9. This may consist of a yoke 19 formed of suitable material, such as heavy steel wire, bent to provide an inturned end 80 adapted to extend into an aperture Bl adjacent the top of the b ock. The opposite end is bent downwardly, as at 82, and then outwardly, as at 83; the portion 82 providing a yielding or spring grip and the portion 63 providing a hand grip portion. The yoke 19 is easily and quickly applied and as easily removed.

It is to be noted that in Figs. 9 and 10, I have shown the blocks at both ends of the tie to be adjustably mounted on their respective rods.

This arrangement is particularly efiicacious where it is desired to use the clamps in the construction of a wall of more than usual thickness. For instance, if a group of clamps as shown in Fig. 9 are made for use in the construction of walls of from 8 to 16 inches in thickness and it is desired to use them in the construction of a 20 inch wall, the additional thickness may be compensated for by the adjustable extensibility of the securing block 25a shown at the left in Fig. 9. In such case the block 25a, being adjustably mounted on the screw-threads 26a may be extended so the shoulders 2! and 53a would meet at a point between the sheathings 20 In Fig. 14 I have shown how a pair of the blocks 25a as shown at the left in Fig. 9, may be used in cases where the intermediate tie portion is intended to remain in the concrete. An intermediate round steel rod, about of an inch in diameter, may be screw-threaded at each end to receive the internally screw-threaded ends of the adjusting and securing rods 48a. After the concrete has set the adjustable ends are removed and the holes formed thereby closed by cementing.

In the use of my improved tie, the block 24 may be set on the screw-threaded end 26 of the rod 23 either in the shop or just before being placed in the forms. Ordinarily the most convenient way will be to adjust block 24 to its proper position of the screw-threaded end 26 just before it is placed in the form, using the gauge marks on the flattened side 44, to set it to the desired thickness of wall Prior to this adjustment the sheathing 20, studs 2| and wales 22 are in place, the latter being positioned for proper' spacing of the ties. The holes 56 are then bored and the rod 23 inserted, from the right in Fig. 1. Rod 48 is then applied and screwed up until the shoulder 53 abuts shoulder 21. Should the sheathings at this time be spaced too far apart they will be drawn together and properly spaced by attaching rod 48, and should they be too close together they will be properly spaced by the blocks 24 and 25 and shoulder 21., when the concrete is poured.

When securing blocks, as shown at left in Fig. 9 and in Fig. 14, are used, they may be removed in the manner hereinbefore described in connection with Fig. 1.

It is to be noted that the use of the screwthreads on the rods will not be objectionable fromv the standpoint of concrete spilling over the side of the form into them, as the wales sufiiciently protect them during pouring of the concrete to admit of no interference in moving the blocks along the threads in effecting removal of the. rods after the concrete has set.

While I have shown and described the preferred specific embodiment of my invention, together with the several preferred modificationsthereof, I nevertheless reserve the right to make such other changes and modifications in structure as will come within the scope of the claims appended hereto.

Having described my invention, I claim:

1. In the concrete form tie, the combination of a tie rod externally screw-threaded at one end for a portion of its length; a nut on said screw-threaded end; a clamping block carried by the block may be adjusted to different positions.

on the rod and held against longitudinal movement thereon, there being cooperative surfaces on said rod and block whereby the block is held against rotation relative to the rod, the opposite end of the rod being screw-threaded to receive a second rod.

2. In a concrete form tie, the combination of: a tie rod externally screw-threaded at one end for a portion of its length; a nut on said screwthreaded end; a clamping block carried by said nut to ride free and clear of the threads, said block comprising a face plate adapted to engage the form, the adjacent end of the nut engaging the rear surface of said face plate; an annular channel in the nut and means cooperating between the clamping block and nut whereby the block may be adjusted to different positions on the rod and held against longitudinal movement thereon, there being cooperative surfaces on said rod and block whereby the block is held against rotation relative to the rod; means on the block adapted to engage the form to hold the block against rotation relative to the form, the opposite end of the rod being screw-threaded to receive a second rod I l I 3. In aconcrete form tie, the combination of: a tie rod externally screw-threaded at one end for a portion of its length; a nut on said screwthreaded end; a clamping block carried by said nut to ride free and clear of the threads, said block comprising a face plate adapted to engage the form; the adjacent end of the nut engaging block may be adjusted to different positions on the rod and held against longitudinal movement thereon, there being cooperative surfaces on said rod and block whereby the block is held against rotation relativeto the rod; the opposite end of said rod being externally screw-threaded, that portion of the rod between said screw-threaded ends being tapered smaller towards the last mentioned screw-threaded end; and clamping means for said last mentioned end.

4. In a concrete form tie, the combination of:

a tie rod externally screw-threaded atone end for a portion of its length; a nut on said screwthreaded end; a clamping block carried by said nut to ride free and clear of the threads, said block comprising a face plate adapted to engage the form, the adjacent end of the nut engaging the rear surface of said face plate; an annular channel in the nut and means cooperating between the clarnping block and nut whereby the block may be adjusted to different positions on the rod and held against longitudinal movement thereon, there being cooperative surfaces on said rod and block whereby the block is held against rotation relative to the rod; means on the block adapted to engage the form to hold the block against rotation relative to the form; latching means cooperative between said block and nut whereby the nut is held against rotation relative to the block; the opposite end of said rod being externally screw-threaded, that portion of the rod between said screw-threaded ends being tapered smaller towards the last mentioned screwthreaded end; and clamping meansfor said last mentioned end.

5. In a concrete form tie, the combination of: a tie rod externally screw-threaded at one end for a portion of its length; a nut on said screwthreaded end; a clamping block carried by said nut to ride free and clear of the threads, said block comprising a face plate adapted to engage the form, the adjacent end of the nut engaging the rear surface of said face plate; an annular channel in the nut and means cooperating between the clamping block and nut whereby the block may be adjusted to different positions on the rod and held against longitudinal movement thereon, there being cooperative surfaces on said rod and block whereby the block is held against rotation relative to the rod; a U-shaped form engaging yoke pivotally mounted at one end on one end of the block to swing in a plane parallel to the axis of the rod, said yoke being constructed and arranged to yieldingly engage over a Wale-piece of a form; the opposite end of said rod being externally screw-threaded, that portion of the rod between said screw-threaded ends being tapered smaller towards the last mentioned screw-threaded end; and clamping means for said last mentioned end.

6'. In a concrete form tie, the combination of: a tie rod externally screw-threaded at one end for a portion of its length; a nut on said screwthreaded end; a clamping block carriediby said 'nut'to'ride free and clear of the threads, said block comprising a face plate adapted to engage the form, the adjacent end of the nut engaging the rear surface of said face plate; an annular channel in the nut and means cooperating'between the clamping block and nut whereby the block may be adjusted to different positions. on the rod and held against longitudinal movement thereon, there beingcooperativesurfaces on said rod and block whereby the block is held against rotation relative to the rod; means on the block adapted to engage the form to hold the block against rotation relative to" theform; latching means 'cooperativebetween said block and nut whereby the nut is held against rotation relative .to the block; a U-shaped form engaging yoke pivotally mounted at one end on one end of the block to swing in a plane parallel to the axis of the rod, said yoke being constructed and arranged to yieldingly engage over a Wale-piece of a form; the opposite end of said rod being externally screw-threaded, that portion of the rod between said screw-threaded endsbeing tapered smaller towards the last mentionedscrew-threaded end; and'clamping means for said last mentioned end.

'7. In a concrete form tie, the combination of: a tie rod formed of two detachably connected parts, one part being externally screw-threaded at one end for a portion of its length; a nut on said screw-threaded end; a clamping block carried by said nut to ride free and clear of the threads, whereby the block may be adjusted to different positions on the rod and held against longitudinal movement thereon, the inner end of the nut bearing against the adjacent face of the block, there being complementary surfaces on said rod and block whereby the block is held against rotation relative to the rod; means on the block adapted to engage a form to hold the block against rotation relative to the form; the opposite end of said rod being reduced to form an annular shoulder and being externally screwthreaded on said reduced portion, that portion of the rod between said screw-threaded ends being tapered smaller towards the reduced end and being of a length to extend through the wall for which it is adapted; the other portion of the rod being bored and internally screw-threaded to receive the externally screw-threaded reduced end of the first mentioned part and being of a larger diameter than the shoulder on the reduced end of the first mentioned part to form an annular shoulder therearound when the two parts are screwed together; a clamping block rotatably mounted adjacent the outer end of the second mentioned part, means to hold said block against longitudinal displacement thereon, there being means associated with said second mentioned part for rotating it.

8. In a concrete form tie, the combination of: a tie rod formed of two detachably connected parts, one part being externally screw-threaded at one end for a portion of itslength; a nut on said screw-threaded end; a clamping block carried by said nut to ride free and clear of the threads, whereby the block may be adjusted to different positions on the rod and held against longitudinal movement thereon, the inner end of the nut bearing against the adjacent face of the block, there being complementary surfaces on said rod and block whereby the block is held against rotation relative to the rod; means on the block adapted to engage a form to hold the .block against rotation relative to the form, the opposite end of said rod being reduced to form an annular shoulder and being externally screwthreaded on said reduced portion, that portion of the rod between said screw-threaded ends being tapered smaller towards the reduced end and being of a length to extend through the wall for which it is adapted; the other portion of the rod being bored and internally screw-threaded to rece'ivethe externally screw-threaded reduced end of the first mentioned part; and a clamping block on said last mentioned part.

9. In a concrete form tie, the combination of: a tie rod formed of two detachably connected parts, one part being externally screw-threaded at one end for a portion of its length; a nut on said screw-threaded end; a clamping block carried by said nut to ride free and clear of the threads, whereby the block may be adjusted to different positions on the rod and held against longitudinal movement thereon, the inner end of the nut bearing against the adjacent face of the block, there being complementary surfaces on said rodand block whereby the block is held against rotation relative to the rod; means on the block adapted to engage a form to hold the block against rotation relative to the form, the

opposite end of said rod being reduced to form an annular shoulder and being externally screwthreaded on said reduced portion, that portion of the rod between said screw-threaded ends being tapered smaller towards the reduced end and being of a length to extend through the Wall for which it is adapted; the other portion of the rod being bored and internally screw-threaded to receive the externally screw-threaded reduced end of the first mentioned part and being of a larger diameter than the shoulder on the reduced end of the first mentioned part to form an annular shoulder therearound when the two parts are screwed together; a clamping block rotatably mounted adjacent the outer end of the second mentioned part, means to hold said block against longitudinal displacement thereon, there being means associated with said second mentioned part for rotating it; and a U-shaped form engaging yoke pivotally mounted at one end on one end of each of said blocks to swing in a plane parallel to the axis of the rod, said yoke being constructed and arranged to yieldingly engage over a Wale-piece of a form, whereby the form walls are held in fixed spaced relation.

AAGE C. JUHL. 

